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git.proxmox.com Git - mirror_ubuntu-eoan-kernel.git/blob - include/linux/err.h
1 /* SPDX-License-Identifier: GPL-2.0 */
5 #include <linux/compiler.h>
6 #include <linux/types.h>
11 * Kernel pointers have redundant information, so we can use a
12 * scheme where we can return either an error code or a normal
13 * pointer with the same return value.
15 * This should be a per-architecture thing, to allow different
16 * error and pointer decisions.
18 #define MAX_ERRNO 4095
22 #define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO)
24 static inline void * __must_check
ERR_PTR(long error
)
26 return (void *) error
;
29 static inline long __must_check
PTR_ERR(__force
const void *ptr
)
34 static inline bool __must_check
IS_ERR(__force
const void *ptr
)
36 return IS_ERR_VALUE((unsigned long)ptr
);
39 static inline bool __must_check
IS_ERR_OR_NULL(__force
const void *ptr
)
41 return unlikely(!ptr
) || IS_ERR_VALUE((unsigned long)ptr
);
45 * ERR_CAST - Explicitly cast an error-valued pointer to another pointer type
46 * @ptr: The pointer to cast.
48 * Explicitly cast an error-valued pointer to another pointer type in such a
49 * way as to make it clear that's what's going on.
51 static inline void * __must_check
ERR_CAST(__force
const void *ptr
)
53 /* cast away the const */
57 static inline int __must_check
PTR_ERR_OR_ZERO(__force
const void *ptr
)
66 #define PTR_RET(p) PTR_ERR_OR_ZERO(p)
70 #endif /* _LINUX_ERR_H */